Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (1): 67-70.DOI: 10.3724/SP.J.1077.2014.13050

• Research Paper • Previous Articles     Next Articles

Dielectric Property of High Density CaCu3Ti4O12 Ceramics

HAO Wen-Tao1, 2, ZHANG Jia-Liang3, XU Pan-Pan3, CAO En-Si1, 2, PENG Hua1, 2   

  1. (1. Key Laboratory of Advanced Transducers and Intelligent Control Systems, Taiyuan University of Technology, Taiyuan 030024, China; 2. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China; 3. School of Physics, Shandong University, Jinan 250100, China)
  • Received:2013-01-21 Revised:2013-03-07 Published:2014-01-20 Online:2013-12-09

Abstract: High density CaCu3Ti4O12 ceramics was prepared by the hot-press sintering technique, and their microstructure, crystalline structure and dielectric property were investigated. The hot-pressed ceramics exhibit the microstructure of bimodal grain distribution with a high theoretical relative density of 98.3%. X-ray diffraction analysis shows that there is Cu2O minor phase in the hot-pressed ceramics whereas only CuO secondary phase exists after a further thermal treatment in ambience. Both the hot-pressed ceramics and its further thermally treated one exhibit two dielectric relaxations at room temperature, whereas the conventionally sintered ceramics have only one dielectric relaxation. Moreover, the hot-pressed CCTO ceramics have an extremely large low-frequency permittivity of 2×105, which further increases to nearly 1×106 through the ambient thermal treatment. The relation between microstructure and dielectric property is also discussed.

Key words: hot-press sintering technique, CaCu3Ti4O12, microstructure, dielectric property

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